Method of rolling iron or steel sheets.



UNITED STATES PATENT OFFICE.

ARTHUR J. MASKREY, OF CANTON, OHIO, ASSIGNOR F ONE-HALF TO JOHN E.CARNAHAN, OF CANTON, OHIO. I

METHOD OF ROLLING IRON OR STEEL Specification of Letters Patent. NoDrawing, Application filed December 26, 1911.

To all coho-m it may concern Be it known that I, ARTHUR J. MAsKREY, acitizen of the United States, residing at Canton, in the county of Starkand State of Ohio, have invented a certain new and useful ImprovedMethod of Rolling Iron or Steel Sheets, of which the following is aspecification.

The invention relates to the process of rolling iron orv steel sheetsfrom bars or plates, and the object of the improvement is to prevent thesticking or welding together of the sheets by the action of the rollswhen the sheets have been reduced to the thinner gages. The process ofrolling such sheets involves the heating of the bars or plates in afurnace to a bright red color, then passing the same, first singly andthen in pairs, between rolls to formthick sheets, then doubling thethick sheets upon themselves to form a pack and again heating andpassing the same between rolls to form thinner sheets; and then doublinthe thinner sheets upon themselves, an againheating and passing the samebetween rolls to form the thinnest sheets.

It is customary to-separate the sheets of the pack after each rollingfor the double purpose of breaking or rupturing any sticking or weldingtogether which may have occurred, and of admitting air between thesheets to effect an oxidation of the surfaces; which separation andexposure to the air is usually suiiicient to prevent a sticking orwelding of the sheets of the pack together during the next succeedingrolling, at least until the sheets have been reduced to the thinnergages. It has been found, however, with respect to certain kinds orgrades of iron or steel, and more particularly with the richer or purerirons or high carbon steels, or steels which contain an alloy of.

other metals, that the sticking or welding together of the sheets cannotbe avoided or prevented by the usual process or method of rolling setforth above, when the sheets have been reduced to about twenty-six gageor thinner. And in general, with all kinds or grades of iron or steel,there is more or less inseparable adhesion of thesheets, proportioned tothe gage to which they have been reduced, with a resulting loss orwastage in =the manufacture thereof.

The separability of the sheets of the pack is probably due to theoxidation of their .or immerse the pack of White Patented June 18, 1912.Serial No. 667,585.

it is very likely that the rolling of the thin ner sheets to thethinnest gages so extends the sheets and thereby so attenuates theoxidat on thereon asto render the same ineflicient to prevent a stickingor welding together of the sheets.

very convenient, and therefore a preferred manner of overcoming thedifiiculty thus set forth in general terms, is to dip sheets, which havebeenrolled'to a thinner gage and folded and separated, in a saturatedsolution of ferrous sulfate or protosulfate of iron; and, when thedipping is done immediately after the sheets have come from the rollsand are yet at a dark red heat, they should be gradually inserted in thesolution so that the same will cool the sheets rather than that thesheets shall unduly heat thesolution.

The solution forms a thin film on the sheets, and, when the waterthereof evaporates, there is left a coating of greenish crystals ofprotosulfate of iron on the which substance is composed of the ferroussulfate and'such Water as is combined to form the crystals; after whichthe sheets are again heated to a bright red for rolling to the thinnestgages, in which process the sulfuric acid is driven off from the film orcoating substance, thus leaving a film sheets,

or coating of red oxid of iron on both sur faces of each sheet,Which'serves to prevent the sheets from welding or sticking togetherbythe final rolling; after which the sheets may be trimmed and separatedin the usual manner.

Itis not intended to limit'thescope of the present invention to the useof a solution of ferrous sulfate for coating the thinner sheets with asubstance which will leave iron oxid thereon, for it is evident that thesame or an equivalent result can be obtained by the use of a solution,as for instance, of protochlorid or perchlorid of iron, from the crystalcoating of which the heat will expel the hydrochloric acid and leave aniron oxid residuum.

Furthermore, it is not essential for the purpose of the presentinvention that a coating substance shall be supplied'or applied on thesheets which will form an iron oxid,

for it is evident that a suitable coating of rolling o the sheets. Andfinally, it is not essential for the general pur ose of the presentinvention that the oxidorming coating substance shall be applied to thesheets in the form of a solution, for it is evident that the same may bespread or sifted on the sheets in a powdered form, as, for instance, inthe form of crystallized and powdered ferrous sulfate.

I claim:

1. In hot rolling a pack of metal sheets, the process which consists incoating the sheets with a metallic oxid forming substance.

2. In hot rolling a pack of metalsheets, the process which consists incoating the sheets with a ferric oxid forming substance.

3. In hot rolling a pack of metal sheets, the process which consists incoating the sheets with a metallic salt to form a metallic oxid thereon.

4. In hot rolling a pack of 'metal sheets,

the process which consists in coating the sheetswith a ferrous salt toform an iron.

oxid thereon.

5. In hot rolling a pack of metal sheets,

the process which consists in dipping the quently heating the sheets toform a coating of iron oxid thereon.

7. In hot rolling a pack of metal sheets,

the process which consists in dip ing the sheets in a solution offerrous sul ate, and

, subsequently heating the sheets to form a coating of iron oxidthereon.

8. In hot rolling a pack of metal sheets, the process which consists indipping the sheets in a saturated solution of ferrous sulfate, andsubsequently heating the sheets to form a coating of iron oxid thereon.

ARTHUR J. MASKREY.

Witnesses:

RUTH A. MILLER, RAY F. KoHL.

